Improvement in saw-mills



UNITED STATES PATENT OEEICE.

IMPROVEMENT IN SAW-MILLS.

Specilication forming part of Letters Patent No. 49,721, dated September5, 1865.

.To all whom t't may concern:

Be it known that I, GILBERT` H. CLEMENs, (United States Army,) ofCincinnati, Hamilton county, Ohio, have invented alnew andusefulImprovement in Saw-Mill Head-Blocks; and I do hereby declare thefollowing to be a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, making part of this specication.

My invention relates to a provision ot' two sets of setting apparatus ona saw-mill headblock, whereby the knee is enabled to set forward orbackward with greater or less speed or power by a given movement ot' thehandwheel, according to the weight of the log, and whereby each knee maybe set forward faster or slower than the other for the manufacture oftapering lumber.

Figure l represents a saw-mill head-block formed on my plan. Fig. 2shows my camshaftfor spreadingand closing the jaws of the nut.

A is my head-block, which may be cast in one solid piece, and may havethe represented indentations F Il" in its top or upper surface.

B b Blr b are side bearings for two precisely similar setting-screws, Cand C', occupying nuts E and E', each ot' which is composed of twojaws,e e', operated by lever G and double cam-shaft H, which occupies slotswithin the jaws e e. This arrangement of eXpansible nut may besubstantially the same as that described in my patent of July l0, 1860.The nuts E and E are hinged to opposite sides of the knee D.

I and J are respectively the master handwheel and shaft, the latterbeing provided with two bevel-wheels, K and L, of unequal size, whichwheels gear with pinions M M on the respective setting-screws G and C.Vhere the log is a light one, and itis desired to set it forwardquickly, the nut E is closed upon the screw O and the nut E is released,while, on the other hand, for a heavy log the screw C and nut E arebrought into service and the others released.

When it is desired to advance one knee more than theother with a givenmotion of the wheel I, that knee has its fast screw() connected with itsnut, to Work in conjunction with the slow screw on the other knee, andthis arrangement being reversed for the next cut, and so on a1-ternately, will enable a log to be cut up into tapering lumber.

If preferred, thespeed of the respective nuts may be varied by the useot' screws of different pitch.

I claim herein as-ncw and of my invention- The provision upon eachhead-block of the two sets of setting apparatus G E e e M, C E e e M,operate/d alternatively, and with unequal speeds, from a singlehand-wheel, substantially as set forth.

In testimony of which invention I hereunto set my hand.

GILBERT H. OLEMENS.

Witnesses:

A. G. GARRITT, L. B. PILLS.

